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19-2358; Rev 1; 3/02
MAX555 Evaluation Kit
General Description
The MAX555 evaluation kit (EV kit) demonstrates the operation of the MAX555 12-bit, 300MHz DAC with ECL-compatible data and clock inputs. By supplying power, digital bit inputs, and a differential clock, the kit allows for quick evaluation of the MAX555's AC performance. The EV kit includes a MAX555. o Fast and Easy Performance Testing o Optimized PC Board Layout o SMA Connectors for All Digital Input and Output Voltages o Includes 50 Termination Resistors o On-Board Voltage Reference and VTT Generators
Features
Evaluates: MAX555
Ordering Information
PART MAX555EVKIT TEMP RANGE 0 to +70C IC PACKAGE 64 TQFP-EP*
*EP = Exposed pad.
Component List
DESIGNATION C1-C4, C7-10, C14-C18, C25, C26, C28 C19, C20 C21 C22 C23, C24 J1-J16 R1-R13, R20, R21 R14 R16 R17 R18 R19 U1 U2 U3 U4 QTY 18 DESCRIPTION 0.1F ceramic capacitors 10F tantalum capacitors, surface-mount 22F tantalum capacitor, surface-mount 47F tantalum capacitor, surface-mount 0.1F ceramic capacitors SMA connectors 51, 5% resistors 121, 1% resistor 82.5, 1% resistor 182, 1% resistor 68.1, 1% resistor 100 trim pot MAX555CCB LM337T MX580KH MAX410CPA
Quick Start
1) Connect the power supply to the MAX555 EV kit. The power-supply input pads are located along the top edge of the board. The board requires a power supply that provides +5V and -5.2V with a common ground. 2) Connect 50 cables to the VOUT and VOUT outputs with proper terminations. 3) Connect a word generator to the data inputs (D0-D11) and the clock inputs. All of these inputs are 100k ECL compatible. 4) Turn on the power-supply and signal sources. 5) Observe the output waveforms on VOUT and VOUT.
2 1 1 2 16 15 1 1 1 1 1 1 1 1 1
________________________________________________________________ Maxim Integrated Products
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MAX555 Evaluation Kit Evaluates: MAX555
Detailed Description
Digital Inputs
The MAX555 EV kit board has high-frequency SMA connectors for the differential-clock and DAC data inputs. Each of these inputs has on-board 50 pulldown resistors terminated to -2V. The -2V supply is regulated down from the -5.2V power supply, as shown in Figure 1. The MAX555 is set up in clocked mode (BYPASS = logic 0) on the EV kit board, with a 50 resistor (R13) connected to -2V. Clocked-mode operation is recommended for all high-speed applications. Removing R13 and connecting the BYPASS pin of the MAX555 to ground selects transparent data mode, as described in the MAX555 data sheet.
Power Supplies
The EV kit requires a -5.2V supply (at 425mA nominal) for the DAC and 50 terminations, and a +5V supply (at 12mA nominal) for the on-board reference circuit, and ground.
DAC Reference Options
The MAX555 uses an external +1V reference, which is supplied on the EV kit board using the circuit shown in Figure 1. This reference voltage can be adjusted to different values between 1.2V and 0.4V using potentiometer R19. V REF can be measured at the V REF pad. The MAX555 typically achieves its best spurious performance with VREF values in the 0.6V to 0.8V range, as described in the MAX555 data sheet. Experimentation with different VREF values is recommended to optimize the AC performance in your application.
DAC Outputs
The MAX555 has complementary voltage outputs, VOUTand VOUT. Both have 50 output impedances and must be terminated correctly to achieve the best performance. Applications requiring a single-ended output should use VOUT, since it is trimmed to higher accuracy than VOUT. Both VOUT and VOUT should always be terminated with 50 to ground for best performance. An alternative way to achieve a single-ended output is to drive a balun transformer with both VOUT and VOUT. This reduces even-order harmonics in the output.
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MAX555 Evaluation Kit Evaluates: MAX555
J3 VREF TEST POINT JU2 +1VREF J5 21 22 J6 8 5 J7 4 3 J8 63 62 61 J9 59 D4 52 J10 51 50 J11 J15 J12 J16 J13 47 56 55 57 D3 D2 D1 D0 (LSB) CLK CLK BYPASS ALTCOMPC 15 C7 0.1F -5.2V ALTCOMPIB LBIAS 30 C8 0.1F -5.2V 1, 14, 16-19, 27, 28, 29, 31-38, 48, 49, 64 12 AGND DGND VOUT 44 45 STAR GROUND AT PIN 15 J2 REF D11 (MSB) D10 D9 D8 D7 D6 D5 VOUT 41 40 23 REF/2 C1 0.1F 20 26 24 25 AVEE 7 53 DVEE ROFFSET LOOPCRNT
C27 OPEN C2 0.1F
-5.2V
J4
C3 0.1F
C4 0.1F
J1
U1
43 LGND 42
MAX555
J14
2, 6, 54, 60
C9 0.1F
C10 0.1F
-5.2V R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 50 50 50 50 50 50 50 50 50 50 50 50 R20 R21 50 50 BYPASS = ANALOG GROUND = DIGITAL GROUND R13 50 -2V
C20 10F
C14 0.1F
C15 0.1F
C19 10F
C16 0.1F
C17 0.1F
C18 0.1F
Figure 1. MAX555 EV Kit Schematic Diagram (Sheet 1 of 2)
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MAX555 Evaluation Kit Evaluates: MAX555
-2V SUPPLY -5.2V +5V
REFERENCE CIRCUIT
C21 22F
3 R14 121 1%
2 IN OUT U2 LM337T
C23 0.01F +VS U3 VOUT MX580KH GND C24 0.01F R19 100 R18 68.1 1%
+5V
-2V
1
ADJ
R17 182 1%
U4 2
C25 0.1F 7 6
3
MAX410
4
+1VREF
C22 4.7F
R16 82.5 1%
C28 0.1F
C26 0.1F
-5.2V
Figure 1. MAX555 EV Kit Schematic Diagram (Sheet 2 of 2)
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MAX555 Evaluation Kit Evaluates: MAX555
1.0"
1.0"
Figure 2. MAX555 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX555 EV Kit Component Placement Guide-- Back Side
1.0"
1.0"
Figure 4. MAX555 EV Kit PC Board Layout--Component Side
Figure 5. MAX555 EV Kit PC Board Layout--Layer 2 (Ground Layer)
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MAX555 Evaluation Kit Evaluates: MAX555
1.0"
1.0"
Figure 6. MAX555 EV Kit PC Board Layout--Back Side
Figure 7. MAX555 EV Kit PC Board Layout--Back Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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